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_mm_cvtt_ps2pi

Microsoft Specific

Generates the Convert Packed Single-Precision Floating-Point Values to Packed Doubleword Integers (cvtps2pi) instruction, which converts the floating-point values in the first two elements in the __m128 structure valueto 32-bit integers and returns an __m64 structure containing the two 32-bit integers.


__m64 _mm_cvtt_ps2pi( 
   __m128 value 
);

[in] value

An __m128 structure containing four single-precision floating-point values.

An __m64 structure containing the two 32-bit integers resulting from the conversion.

Intrinsic

Architecture

_mm_cvtt_ps2pi

x86 with SSE2

Header file <intrin.h>

This intrinsic differs from _mm_cvt_ps2pi only in that the floating-point values are truncated rather than rounded according to the setting of the MXCSR register.

Because __m128 represents an XMM register and __m64 represents an MMX register, this intrinsic generates an instruction that operates on these registers directly and does not involve system memory.

This routine is only available as an intrinsic.

// _mm_cvtt_ps2pi.cpp
// processor: x86

#include <intrin.h>
#include <stdio.h>

#pragma intrinsic(_mm_cvtt_ps2pi)

int main()
{
    __m128 a;
    __m64 b;

    float af[4] = { 101.5, 200.5,300.5, 400.5 };

    // Load a with the floating point values
    // _mm_loadu_ps allowed unaligned addresses
    a = _mm_loadu_ps(af);

    //
    b = _mm_cvtt_ps2pi(a);

    // Return to floating point 
    _mm_empty();

    // Print out the values in b
    printf_s("%d %d\n", b.m64_i32[0], b.m64_i32[1]);
}
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